A Census Bureau report indicates that the U.S. population will rise to 439 million by 2050, or 135 million more than today. More than 80 percent of U.S. population growth will continue to be a direct result of immigration and births to immigrants. In California -- where the population increases by a half million per year -- that immigration component accounts for virtually 100 percent of the growth.

"Water is a precious resource, and as with other resources, we must learn to use it more efficiently. But we must also limit the demands that we place on our resources, and that means limiting immigration as well," Hull said.{09A1500E-BBBC-453F-85E6-82B585EF3CB1}&dist=hppr

Updated: Tue, Oct 21st 2008 @ 1:04pm EDT